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I = int 1/(cos^4 x) dx is equal to...

`I = int 1/(cos^4 x) dx` is equal to

A

`2 sqrt2 (cot x + tan^-1 sqrt2 cot x)`

B

`-1/(2 sqrt2) (sqrt2 cot x + tan^-1 (sqrt2 cot x))` + c

C

`2 sqrt2 (cot x + tan^-1(cot x))`

D

None of these

Text Solution

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The correct Answer is:
D
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PATHFINDER-INDEFINITE INTEGRATION-QUESTION BANK
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